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One is the fastest man on Earth. The other is the Woman of Steel from Krypton. Usually separated by a few dozen inter-dimensional planes, Barry Allen and Kara Danvers came together Tuesday to prove they have, at least, one thing in common: some impressive pipes. The dynamic duo were aces in “Duet,” the long-teased (and let’s be honest, inevitable) musical crossover, which marked their second outing together — the first since “Supergirl” moved to The CW. Putting to good use… Read More »